Cardiomyopathy and exercise intolerance in muscle glycogen storage disease 0

N Engl J Med. 2007 Oct 11;357(15):1507-14. doi: 10.1056/NEJMoa066691.

Abstract

Storage of glycogen is essential for glucose homeostasis and for energy supply during bursts of activity and sustained muscle work. We describe three siblings with profound muscle and heart glycogen deficiency caused by a homozygous stop mutation (R462-->ter) in the muscle glycogen synthase gene. The oldest brother died from sudden cardiac arrest at the age of 10.5 years. Two years later, an 11-year-old brother showed muscle fatigability, hypertrophic cardiomyopathy, and an abnormal heart rate and blood pressure while exercising; a 2-year-old sister had no symptoms. In muscle-biopsy specimens obtained from the two younger siblings, there was lack of glycogen, predominance of oxidative fibers, and mitochondrial proliferation. Glucose tolerance was normal.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biopsy
  • Cardiomyopathy, Hypertrophic / genetics*
  • Child
  • Child, Preschool
  • Codon, Nonsense*
  • DNA Mutational Analysis
  • Exercise Tolerance / genetics*
  • Female
  • Glucose Tolerance Test
  • Glycogen / analysis*
  • Glycogen Storage Disease / genetics*
  • Glycogen Synthase / deficiency
  • Glycogen Synthase / genetics*
  • Homozygote
  • Humans
  • Liver Glycogen / analysis
  • Male
  • Mitochondria / metabolism
  • Muscle, Skeletal / enzymology*
  • Muscle, Skeletal / pathology
  • Myocardium / enzymology
  • Myocardium / pathology

Substances

  • Codon, Nonsense
  • Liver Glycogen
  • Glycogen
  • Glycogen Synthase